"i'm really unaware of this," he told us. he said we should go to a village, the mass producer of oil paintings in the world. 15,000 workers churn out $600 billion worth of oil paintings a year. the majority are knockoffs. american hotel and retail chains are among its biggest customers. under chinese law, artists are only allowed to copy the work of other artists who have been dead for more than 50 years. but we commissioned four replicas of hobart's painting for less than $40 each. u.s. law enforcement tells artists like clinton hobart there is little they can do unless they hire copyright attorneys. >> it takes so much money. you need to be so big in order to stop them, and they know it. >> reporter: he plans to watermark images of his paintings online, if only to make his counterfeiters' jobs a little harder. seth doane, cbs news, china. >> pelley: and that's the authentic cbs evening news for tonight. for all of us at cbs news all around the world, good night. captioning sponsored by cbs captioned by media access group a